Frame member for vehicle

Abstract

Provided is a frame member for a vehicle, the frame member being easy to absorb an expected impact load by uniformly compressing the impact load in the axial direction when the impact load is input. A frame member (2) for a vehicle is provided with: a frame body section (20A) having a closed cross-section (7a) having a plurality of apexes (P1 to P12) in a cross-section orthogonal to the direction of extension; side wall sections (20c, 20d) that form the closed cross-section (7a) and that are paired in the width direction of the vehicle body; groove sections (25, 26) that are formed by recessing the paired side wall sections (20c, 20d) toward the inside of the closed cross-section (7a); and a plurality of flanges (20e, 20f) that protrude toward the outside of the closed cross-section (7a). Wherein the closed cross-section (7a) includes protruding positions of the plurality of flanges (20e, 20f), is centrosymmetric with respect to a graphic center Z of the closed cross-section (7a), and is non-axisymmetric with respect to all straight lines passing through the graphic center Z and perpendicular to the front-rear direction.

Description

Technical Field

[0001] This invention relates to a frame component for vehicles. Background Technology

[0002] Patent document 1 discloses a vehicle frame member that extends in the front-rear direction of the vehicle body and has a cap-shaped inner plate with a cross section orthogonal to the extension direction that opens outward in the width direction of the vehicle body and a cap-shaped outer plate with a cross section orthogonal to the extension direction that opens inward in the width direction of the vehicle body. It also has a closed cross section orthogonal to the extension direction formed by joining the upper and lower flanges of the inner plate and the outer plate in the width direction of the vehicle body.

[0003] [Existing Technical Documents] [Patent Documents] [Patent Document 1] Japanese Patent Application Publication No. 2009-166697 Summary of the Invention

[0004] [The technical problem the invention aims to solve] In the vehicle frame component of Patent Document 1, the flange is offset to the outside in the width direction of the vehicle body. Therefore, the outer panel has higher resistance to compressive bending than the inner panel. When an impact load is input from one side in the front-rear direction, the inner panel is more prone to buckling than the outer panel. As a result, it is difficult to achieve uniform axial compression of the vehicle frame component when an impact load is input, making it difficult to absorb the expected impact load.

[0005] The present invention provides a vehicle frame member that, when an impact load is input, easily absorbs the expected impact load through uniform axial compression.

[0006] Technical means to solve technical problems This invention provides a vehicle frame member that extends in the longitudinal direction and comprises: The main body of the frame has a closed section with multiple vertices, with the cross section orthogonal to the extension direction; A groove is formed by recessing the paired sidewall portions of the closed cross section in the width direction of the vehicle body towards the inside of the closed cross section. A plurality of flanges protruding outward from the closed cross-section; wherein, The closed section, including the protruding positions of the plurality of flanges, is centrally symmetrical with respect to the graphic center of the closed section portion, and is not axially symmetrical with respect to all straight lines passing through the graphic center and perpendicular to the front-back direction.

[0007] According to the present invention, the closed section of the vehicle frame member, including the protruding positions of a plurality of flanges, is centrally symmetrical with respect to the graphic center of the closed section. Therefore, even when the protruding positions of each flange are offset in the width direction of the vehicle body for mounting components such as suspension covers, the difference in the compressive bending resistance of the vehicle frame member with respect to loads from the front-rear direction in the width direction of the vehicle body can be suppressed. Thus, when an impact load is input, the vehicle frame member is easily compressed axially with stable action, and the expected impact load is easily absorbed. Furthermore, compared to the case without grooves, the moment of inertia of the vehicle frame member can be increased, and the compressive bending resistance can be improved. Therefore, by making the closed section including the grooves centrally symmetrical with respect to the graphic center of the closed section, the compressive bending resistance and stable axial compression of the vehicle frame member can be achieved.

[0008] [Invention Effects] According to the present invention, a vehicle frame member can be provided that readily absorbs the expected impact load by uniform axial compression when an impact load is input. Attached Figure Description

[0009] Figure 1 This is a top view of the front body structure having the vehicle frame members according to an embodiment of the present invention. Figure 2 This is a side view of the front body structure. Figure 3 A single oblique view of a frame component for a vehicle; Figure 4 To illustrate schematically along Figure 3 A schematic diagram of the cross-section of the vehicle frame component for the IV-IV line; Figure 5 For along Figure 3 Cross-sectional view of the vehicle frame component with V-V lines; Figure 6 To illustrate schematically along Figure 3 A schematic diagram of the cross-section of the vehicle frame component for the VI-VI line; Figure 7 This is an enlarged view of the area surrounding the suspension cover of the front vehicle body structure. Figure 8 Enlarged view of the connecting components between the vehicle frame and the subframe, and the surrounding area; Figure 9 A schematic diagram illustrating the cross-section of the first modified example of the vehicle frame member; Figure 10 A schematic diagram illustrating the cross-section of a second modified example of a vehicle frame member. Detailed Implementation

[0010] The embodiments of the present invention are described below with reference to the accompanying drawings. The following description is merely illustrative and does not constitute any limitation on the invention, its applicability, or its uses.

[0011] Figure 1 and Figure 2 The diagram illustrates a front body structure 1 of a vehicle equipped with a vehicle frame member according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the front body structure 1 includes: a front bulkhead 10 separating the passenger compartment C and the engine compartment E; a pair of left and right front side frames 20 extending forward from the front bulkhead 10; and a pair of left and right skirt reinforcement members (hereinafter also referred to as skirt reinforcement members) 30 extending outward and upward from the front of the front bulkhead 10 in the body width direction relative to the front side frames 20. The skirt reinforcement members 30 are connected at the front end by a shroud upper member 31 extending in the body width direction.

[0012] The front body structure 1 includes: a pair of left and right shield assemblies 32 that connect the upper shield 31 and the front end of the front side frame 20 in the vertical direction; a pair of left and right suspension covers (hereinafter also referred to as suspension covers) 40 disposed between the front bulkhead 10 and the shield assembly 32 in the front-rear direction; a subframe 50 disposed below the front side frame 20; and a pair of left and right connecting members 51 that connect the subframe 50 and the front side frame 20 in the vertical direction.

[0013] At the front end of each front side frame 20, a main energy-absorbing box 61, consisting of a cylindrical body or the like, that absorbs impact loads from the front of the vehicle body, extends forward. The left and right pairs of main energy-absorbing boxes 61 are connected to each other by bumper reinforcement members 62 extending in the width direction of the vehicle body. At the front end of each subframe 50, a secondary energy-absorbing box 63, consisting of a cylindrical body or the like, that absorbs impact loads from the front of the vehicle body, extends forward. The left and right pairs of secondary energy-absorbing boxes 63 are connected to each other by secondary bumper reinforcement members 64 extending in the width direction of the vehicle body.

[0014] like Figure 2 As shown, each front side frame 20 has a straight portion 2a extending generally horizontally forward and an inclined portion 2b extending obliquely downward from the rear end of the straight portion 2a toward the rear of the vehicle body.

[0015] After the impact load is input from the front of the vehicle towards the bumper reinforcement 62, part of the impact load is absorbed by the main energy absorption box 61 and the front side frame 20, and dispersed to the rear of the vehicle frame.

[0016] Figure 3 This is a single oblique view of the front side frame 20. Figure 4 It is a schematic diagram along Figure 3A schematic diagram of the cross-section of the IV-IV line (the cross-section of the front portion 2c of the straight section 2a of the front side frame 20). In this embodiment, the left and right front side frames 20 have a roughly symmetrical structure. Therefore, in this embodiment, the structure of the front side frame 20 on the right side in the vehicle width direction will be described.

[0017] Reference Figure 3 and Figure 4 The front side frame 20 absorbs impact loads through axial compression when impact loads are input in the longitudinal direction of the vehicle body. The front side frame 20 is formed, for example, of iron or aluminum. The front side frame 20 includes a frame body 20A, which has an upper wall 20a, a lower wall 20b, and a pair of side wall portions 20c and 20d, and has a closed section 7a with a plurality of vertices orthogonal to the extending direction. The front side frame 20 has grooves 25 and 26 that recess each side wall portion 20c and 20d toward the inside of the closed section 7a, and the grooves 25 and 26 extend in the longitudinal direction. The front side frame 20 has an upper flange 20e and a lower flange 20f that protrude outward (in the vertical direction in this embodiment) from the closed section 7a, respectively.

[0018] like Figure 4 As shown, the front side frame 20 is formed by welding together a plurality of sheet metal components. In this embodiment, the front side frame 20 has an inner sheet 21 located inside the vehicle body width direction and an outer sheet 22 located outside the vehicle body width direction.

[0019] The inner panel 21 has: an inner upper wall portion 21a extending in the width direction of the vehicle body, an inner lower wall portion 21b opposite to the inner upper wall portion 21a and extending in the width direction of the vehicle body, an inner side wall portion 21c connecting the inner ends of the inner upper wall portion 21a and the inner lower wall portion 21b, and upper and lower flanges 21e and 21f extending in the upper and lower directions respectively from the outer ends of the inner upper wall portion 21a and the outer ends of the inner lower wall portion 21b. The cross section of the inner panel 21 orthogonal to the extension direction is a cap shape that bulges inward in the width direction of the vehicle body.

[0020] The outer panel 22 has: an outer upper wall portion 22a extending in the width direction of the vehicle body, an outer lower wall portion 22b opposite to the outer upper wall portion 22a and extending in the width direction of the vehicle body, an outer wall portion 22c connecting the outer ends of the outer upper wall portion 22a and the outer lower wall portion 22b, and upper and lower flanges 22e and 22f extending upward and downward from the inner ends of the outer upper wall portion 22a and the outer lower wall portion 22b, respectively. The cross section of the outer panel 22 orthogonal to the extension direction is a cap shape that bulges outward in the width direction of the vehicle body.

[0021] The upper flanges 21e, 22e and the lower flanges 21f, 22f of the inner panel 21 and the outer panel 22 are joined by welding or other means in the width direction of the vehicle body, thereby forming a front side frame 20 with a closed cross section 7a that is approximately rectangular in shape.

[0022] The upper wall portion 20a, lower wall portion 20b, and paired side wall portions 20c, 20d of the front side frame 20 are respectively composed of the upper wall portions 21a, 22a, lower wall portions 21b, 22b, and side wall portions 21c, 22c of the inner plate 21 and the outer plate 22. The upper flange 20e and lower flange 20f of the front side frame 20 are respectively composed of the upper flanges 21e, 22e and lower flanges 21f, 22f of the inner plate 21 and the outer plate 22.

[0023] In the vehicle body width direction, the upper flange 20e is located on one side (outer or inner) relative to the graphic center Z of the closed section 7a, while the lower flange 20f is located on the other side. In this embodiment, the upper flange 20e is located on the outer side relative to the lower flange 20f in the vehicle body width direction. The separation distances L1 and L2 of the upper flange 20e and the lower flange 20f relative to the graphic center Z of the closed section 7a in the vehicle body width direction are approximately the same. In this specification, "approximately the same" and "approximately equal" include errors that may occur during the manufacturing of the inner panel 21 and the outer panel 22.

[0024] In this specification, the graphic center Z of the closed section 7a refers to... Figure 4 The intersection of a straight line C1 passing through the midpoint (center) of the upper wall portion 20a and the lower wall portion 20b in the vertical direction and a straight line C2 passing through the midpoint (center) of the paired side wall portions 20c and 20d in the vehicle width direction in the cross section of the designated area of ​​the front side frame 20 shown. In this embodiment, the designated area is the front portion 2c of the straight section 2a of the front side frame 20.

[0025] Grooves 25 and 26 are formed on each side wall portion 21c and 22c of the inner panel 21 and the outer panel 22. The grooves 25 and 26 are recessed toward the inside of the closed section 7a (recessed toward the side wall portion 21c and 22c on the other side) and extend in the front-rear direction of the vehicle body.

[0026] like Figure 4 As shown, the grooves 25 and 26 are positioned opposite each other in the width direction of the vehicle body. In this embodiment, the width W of the grooves 25 and 26 in the vertical direction is set to 1 / 3 of the height H of the closed section 7a. The middle (center) P of the width W of the grooves 25 and 26 in the vertical direction coincides with the straight line C1, and the grooves 25 and 26 are located at the middle of the vertical direction of the closed section 7a.

[0027] In this embodiment, the depth D of the grooves 25 and 26 is approximately the same as their width W. The depth D of the grooves 25 and 26 is set to be less than the vehicle width distance W2 from the side wall portions 20c and 20d to the graphic center Z. The grooves 25 and 26 are located on the outer side relative to the straight line C2 that passes through the graphic center Z and extends in the vertical direction. The depth D of the grooves 25 and 26 is approximately the same as the vehicle width dimensions L3 and L4 of the outer upper wall portion 22a and the inner lower wall portion 21b.

[0028] Each groove portion 25, 26 has: an upper groove wall portion 25a, 26a located on the upper side and extending in the vehicle width direction in the closed section 7a; a lower groove wall portion 25b, 26b located on the lower side and extending in the vehicle width direction in the closed section 7a and opposite to the upper groove wall portion 25a, 26a; and a bottom groove wall portion 25c, 26c connecting the inner ends of the upper groove wall portion 25a, 26a and the lower groove wall portion 25b, 26b in the vertical direction.

[0029] Reference Figure 4 The bending stiffness of the side wall portion 21c of the inner plate 21 and the side wall portion 22c of the outer plate 22 are approximately equal. Specifically, each side wall portion 21c, 22c of the inner plate 21 and the outer plate 22 is composed of a plurality of side wall portions, each with approximately equal bending stiffness. In this embodiment, the bending stiffness of each of the plurality of side wall portions is the bending stiffness of each side wall portion perpendicular to the surface direction (thickness direction).

[0030] In each side wall portion 21c, 22c of the inner plate 21 and the outer plate 22, a plurality of side wall portions have: upper side wall portions 21g, 22g located above each groove portion 25, 26; lower side wall portions 21h, 22h located below each groove portion 25; groove upper wall portions 25a, 26a; groove lower wall portions 25b, 26b; and groove bottom wall portions 25c, 26c. The plate thickness t1 and the side length L5 in the closed section 7a of each plurality of side wall portions are approximately the same. Furthermore, the plate thickness t2 and the side lengths L4, L3 of each upper wall portion 22a, 21b of the inner plate 21 and the outer plate 22 are approximately the same as those of each side wall portion.

[0031] like Figure 4As shown, the closed section 7a has a plurality of vertices (vertices 1 to 12) P1 to P12. Vertex 1 P1 is the intersection of the outer upper wall 22a and the upper side wall 22g. Vertex 2 P2 is the intersection of the upper side wall 22g and the upper wall 26a of the groove. Vertex 3 P3 is the intersection of the upper wall 26a of the groove and the bottom wall 26c of the groove. Vertex 4 P4 is the intersection of the bottom wall 26c of the groove and the lower wall 26b of the groove. Vertex 5 P5 is the intersection of the lower wall 26b of the groove and the lower side wall 22h. Vertex 6 P6 is the intersection of the lower side wall 22h and the outer lower wall 22b. Vertex 7 P7 is the intersection of the inner lower wall 21b and the lower side wall 21h. Vertex 8 P8 is the intersection of the lower side wall 21h and the lower wall 25b of the groove. Vertex P9, the 9th vertex, is the intersection of the lower wall portion 25b and the bottom wall portion 25c of the groove. Vertex P10, the 10th vertex, is the intersection of the bottom wall portion 25c and the upper wall portion 25a of the groove. Vertex P11, the 11th vertex, is the intersection of the upper wall portion 25a and the upper side wall portion 21g of the groove. Vertex P12, the 12th vertex, is the intersection of the upper side wall portion 21g and the inner upper wall portion 21a.

[0032] The closed section 7a, including the protruding positions of the upper and lower flanges 20e and 20f, is centrally symmetric with respect to the graphic center Z of the closed section 7a, and is not axially symmetric with respect to all straight lines passing through the graphic center Z and perpendicular to the front-back direction. Central symmetry with respect to the graphic center Z means that when the closed section 7a is rotated 180 degrees around the graphic center Z, the protruding positions of vertices P1 to P6 (1-6) and the upper flange 20e are approximately the same as the protruding positions of vertices P7 to P12 (7-12) and the lower flange 20f before the rotation.

[0033] Reference Figure 5 and Figure 6 The grooves 25 and 26 are deeper at the rear of the vehicle than at the front. More specifically, compared to... Figure 4 Regarding the slots 25 and 26 of the closed section 7a located on the front side portion 2c of the front side frame 20, Figure 6 The grooves 125 and 126 of the closed section 7b located on the rear side portion 2d of the front side frame 20 are deeper than the depth D2. The side length L15 of the upper wall portion 125a, 126a and the lower wall portion 125b, 126b of the groove in the closed section 7b is longer than the side length L5 of the bottom wall portion 125c, 126c, the upper side wall portion 21g, 22g and the lower side wall portion 21h, 22h of the groove in the closed section 7b.

[0034] like Figure 3 , 4 As shown in Figure 5, the upper flange 20e of the rear portion 2d of the front side frame 20 protrudes upward compared to the upper flange 20e of the front portion 2c. More specifically, regarding the upper flange 22e of the outer panel 22, the rear portion 2d is longer than the front portion 2c.

[0035] In this embodiment, the front portion 2c of the front side frame 20 is as follows: Figure 2 As shown, the front part of the straight section 2a is relative to the suspension cover 40, and the rear part 2d is the part of the straight section 2a on which the suspension cover 40 is installed.

[0036] like Figure 1 , 2 and Figure 7 As shown, a suspension cover 40 is mounted on the front side bracket 20. The suspension cover 40 supports the upper end of the front suspension (not shown) located at a desired position at the front of the vehicle body relative to the front bulkhead 10. The suspension cover 40 is mounted across the side skirt reinforcement 30 and the front side bracket 20.

[0037] like Figure 7 As shown, the suspension cover 40 is a generally conical cylinder that extends downward from a generally disc-shaped upper side. The suspension cover 40 has a generally disc-shaped suspension top support portion 40a that supports the suspension, and a support portion 40b that extends downward from the suspension top support portion 40a. The suspension top support portion 40a is fixed to the upper side of the skirt reinforcement member 30 by welding or the like.

[0038] The support portion 40b extends downward from the radially outer end of the suspension top support portion 40a. The upper end of the support portion 40b is fixed to the lower end of the suspension top support portion 40a and the inner side of the side skirt reinforcement 30 by welding or the like. The lower end of the support portion 40b is fixed by welding or the like, with its outer side coinciding with the upper flange 22e of the outer plate 22 of the front side frame 20 from the outer side of the vehicle body width direction.

[0039] The suspension cover 40 includes a first reinforcing member 42. The first reinforcing member 42 is disposed adjacent to the front side of the support portion 40b and has a generally cap-shaped cross-section that opens outward in the width direction of the vehicle body, extending in the vertical direction. The upper end portion 42a of the first reinforcing member 42 is joined to the front side portion of the support portion 40b, which is fixed to the inner side of the skirt reinforcement member 30, by welding or the like. The lower end portion 42b of the first reinforcing member 42 is fixed to the inner upper wall portion 21a and the inner side wall portion 21c of the inner panel 21 by welding or the like. The lower end portion 42b of the first reinforcing member 42 is provided with an upper side fixing portion 42c fixed to the inner upper wall portion 21a and a side fixing portion 42d fixed to the inner side wall portion 21c. The paired flange portions 42e of the first reinforcing member 42, extending in the longitudinal direction, are joined to the front side of the support portion 40b by welding or the like.

[0040] like Figure 2As shown, the suspension cover 40 includes a second reinforcing member 43 disposed on the outer side of the support portion 40b in the vehicle body width direction. The second reinforcing member 43 is generally cap-shaped and extends in the vertical direction. Paired flange portions 43a of the second reinforcing member 43 extending in the front-rear direction are joined to the support portion 40b from the outer side of the vehicle body width direction by welding or the like. The paired flange portions 43a are joined to the upper flange 22e of the outer panel 22 at the lower end 43b of the second reinforcing member 43 by welding or the like. The second reinforcing member 43 has a side fixing portion 43c at its lower end 43b that is joined to the outer side wall portion 22c by welding or the like.

[0041] like Figure 2 and Figure 8 As shown, the subframe 50 and the front side frame 20 are connected by a connecting member 51. The connecting member 51 has: a lower connecting member 52 located on the lower side and connected to the subframe 50, an upper connecting member 53 located on the upper side and connected to the front side frame 20, and a fastening member 56 that fastens the lower connecting member 52 and the upper connecting member 53 together.

[0042] The lower connecting member 52 has a generally U-shaped cross-section that opens forward and extends in the vertical direction. The lower connecting member 52 is fixed to the subframe 50 at its lower end by welding or the like. The plate member 52a for mounting the fastening member 54 is joined to the upper end of the lower connecting member 52 by welding or the like.

[0043] The upper connecting member 53 has: a U-shaped column member 54 with an approximately open cross-section to the outside in the width direction of the vehicle body, and an L-shaped plate member 55 covering the outside and below of the column member 54 in the width direction of the vehicle body.

[0044] The column member 54 has: an inner wall 54a extending in the vertical direction, a front wall 54b and a rear wall 54c extending outward in the width direction from the front and rear edges of the inner wall 54a, and a pair of front and rear flanges 54d extending forward and backward respectively from the outer edges of the front wall 54b and the rear wall 54c.

[0045] The plate member 55 has a longitudinal wall 55a extending in the vertical direction and a bottom wall 55b extending from the lower end of the longitudinal wall 55a toward the inside in the width direction of the vehicle body. The upper connecting member 53 is formed into a hollow box shape by welding the paired flange portions 54d of the connecting column member 54 and the longitudinal wall 55a of the plate member 55 in the width direction.

[0046] The column member 54 has a side fixing part 54e extending upward from the inner wall 54a and fixed to the side wall portion 21c of the inner plate 21, and a lower side fixing part 54f extending forward and backward from the upper edges of the front wall 54b and the rear wall 54c and fixed to the lower wall portion 21b of the inner plate 21, respectively. The plate member 55 is joined to the lower flange portion 21f of the inner plate 21 at its upper end 55c by welding or the like.

[0047] Fastening members 56 include, for example, welded nuts and bolts fixed to the longitudinal wall of the cut plate member 55 and formed by a tongue portion 55d folded inward in the width direction of the vehicle body. The upper connecting member 53 and the lower connecting member 52 are connected by screwing a bolt into the plate member 52a from below and engaging it with a welded nut.

[0048] The vehicle frame member 20 according to the above embodiments can achieve the following effects.

[0049] The front side frame 20 extending in the longitudinal direction includes: a frame body 20A with a closed section 7a having a plurality of vertices P1 to P2 orthogonal to the extension direction; grooves 25 and 26 formed by recessing the paired side wall portions 20c and 20d forming the closed section 7a toward the inside of the closed section 7a; and a plurality of flanges 20e and 20f protruding outward from the closed section 7a. The closed section 7a, including the protruding positions of the plurality of flanges 20e and 20f, is centrally symmetrical with respect to the graphic center Z of the closed section 7a, and is non-axially symmetrical with respect to all straight lines passing through the graphic center Z and perpendicular to the longitudinal direction.

[0050] According to the present invention, the closed section 7a of the front side frame 20, including the protruding positions of the flanges 20e and 20f, is symmetrical about the Z-center of the closed section 7a. Therefore, even if the flanges 20e and 20f are offset in the width direction of the vehicle body, the difference in the compressive bending resistance of the front side frame 20 relative to loads from the width direction of the vehicle body can be suppressed. Thus, when an impact load is input, the front side frame 20 is easily compressed axially with stable action, and the expected impact load is easily absorbed. Furthermore, compared to the case without the grooves 25 and 26, the moment of inertia of the front side frame 20 section can be increased, and the compressive bending resistance can be increased. Therefore, by making the closed section 7a including the grooves 25 and 26 symmetrical about the Z-center of the closed section 7a, the compressive bending resistance and stable axial compression of the front side frame 20 can be achieved.

[0051] The vehicle frame components are the left and right pairs of front side frames 20 located on both sides of the body width direction in the engine compartment E.

[0052] According to this structure, when an impact load is input from the front of the vehicle, the front side frame 20 is easily subjected to stable axial compression.

[0053] The slots 25 and 26 are positioned opposite each other in the width direction of the vehicle body.

[0054] According to this structure, compared with the case where the vertical positions of the grooves 25 and 26 are different, it is also easier to suppress the difference in bending stiffness of the front side frame 20 in the vertical direction, and it is easier to make the front side frame 20 axially compressed evenly.

[0055] The grooves 25 and 26 have: upper groove wall portions 25a and 26a located on the upper side and extending inward; lower groove wall portions 25b and 26b located on the lower side and extending inward and opposite to the upper groove wall portions 25a and 26a; and bottom groove wall portions 25c and 26c connecting the inner ends of the upper groove wall portions 25a and 26a and the lower groove wall portions 25b and 26b in the vertical direction. The side lengths of the upper groove wall portions 25a and 26a, the lower groove wall portions 25b and 26b, and the bottom groove wall portions 25c and 26c are equal in the closed section 7a.

[0056] According to this structure, compared with the case where the side lengths of the three sides of the groove wall portions 25a, 26a, 25b, 26b, 25c, 26c constituting the groove portions 25, 26 are different, it is easier to suppress the difference in bending stiffness of the groove wall portions 25a, 26a, 25b, 26b, 25c, 26c constituting the groove portions 25, 26, and it is easier to make the front side frame 20 stably axially compressed.

[0057] The grooves 25 and 26 are deeper on the rear side of the vehicle body compared to the front side.

[0058] According to this structure, the rear portion 2d of the front side frame 20 has increased rigidity compared to the front portion 2c. Therefore, the front portion 2c can absorb impact loads by deforming under impact loads from the front of the vehicle body, and in order for the front portion 2c to effectively absorb impact loads, the rear portion 2d, with its increased rigidity, can bear the impact loads.

[0059] The present invention is not limited to the structure described in the embodiments, and various modifications can be made.

[0060] In this embodiment, the structure in which flanges 20e and 20f extend from the closed section 7a in the upward and downward directions is described. However, the present invention is not limited to this, and for example, it may also be as follows: Figure 9 As shown, flanges 120e and 120f extend from the closed section 7c in the wide direction.

[0061] In this embodiment, a structure in which the grooves 25 and 26 are aligned vertically is described. However, the invention is not limited to this; the grooves 25 and 26 can be symmetrical about the center Z of the pattern. For example, it can also be as follows: Figure 10 As shown, the grooves 225 and 226 are offset in the vertical direction.

[0062] In this embodiment, the grooves 25 and 26 are described as having a cap-shaped structure, but the present invention is not limited thereto, and the grooves 25 and 26 may also be trapezoidal, semi-circular, etc.

[0063] In this embodiment, a vehicle frame member with an inner plate 21 and an outer plate 22 is described. However, the present invention is not limited thereto, and the vehicle frame member may also be an extruded member of aluminum or the like.

[0064] [Note] This disclosure includes the following forms.

[0065] [Form 1] A vehicle frame member, which is a vehicle frame member extending in the longitudinal direction, comprises: The main body of the frame has a closed section with multiple vertices, with the cross section orthogonal to the extension direction; A groove is formed by recessing the paired sidewall portions of the closed cross section in the width direction of the vehicle body towards the inside of the closed cross section. A plurality of flanges protruding outward from the closed cross-section; wherein, The closed section, including the protruding positions of the plurality of flanges, is centrally symmetrical with respect to the graphic center of the closed section and is non-axially symmetrical with respect to all straight lines passing through the graphic center and perpendicular to the front-back direction.

[0066] [Form 2] The vehicle frame component according to form 1. The vehicle frame components are the left and right pairs of front side frames located on both sides of the vehicle body in the width direction of the engine compartment.

[0067] [Form 3] Vehicle frame components according to form 1 or form 2. The grooves are arranged opposite each other in the width direction.

[0068] [Form 4] Vehicle frame components according to any one of forms 1 to 3 The groove portion has: an upper groove wall portion located on the upper side and extending inward, a lower groove wall portion located on the lower side and extending inward and opposite to the upper groove wall portion, and a bottom groove wall portion connecting the inner ends of the upper groove wall portion and the lower groove wall portion in the vertical direction. The upper wall, lower wall, and bottom wall of the groove have equal side lengths in the closed cross-section.

[0069] [Form 5] Vehicle frame components according to any one of forms 1 to 4 The groove is deeper on the rear side of the vehicle body compared to the front side.

[0070] [Numbering Explanation] 7 Closed section 20 Front side frame (vehicle frame component) 20A Main Frame Section 20c Sidewall 20d sidewall 20e upper flange 20f Lower flange 25. Groove section 25a Upper wall of the groove 25b Lower wall of the groove 25c bottom wall of the tank 26. Groove 26a Upper wall of the groove 26b Lower wall of groove 26c Bottom wall of the tank P1~P12 Multiple vertices Z Graphic Center

Claims

1. A vehicle frame member extending in a longitudinal direction, comprising: The main body of the frame has a closed section with multiple vertices, with the cross section orthogonal to the extension direction; A groove is formed by recessing the paired sidewall portions in the width direction of the vehicle body towards the inside of the closed cross section. A plurality of flanges protruding outward from the closed cross-section; wherein, The closed section, including the protruding positions of the plurality of flanges, is centrally symmetrical with respect to the graphic center of the closed section and is not axially symmetrical with respect to all straight lines passing through the graphic center and perpendicular to the front-back direction.

2. The vehicle frame component according to claim 1, characterized in that: The vehicle frame components are the left and right pairs of front side frames located on both sides of the vehicle body in the width direction of the engine compartment.

3. The vehicle frame component according to claim 1 or 2, characterized in that: The grooves are arranged opposite each other in the width direction of the vehicle body.

4. The vehicle frame component according to claim 1 or 2, characterized in that: The groove portion has: an upper groove wall portion located on the upper side and extending inward, a lower groove wall portion located on the lower side and extending inward and opposite to the upper groove wall portion, and a bottom groove wall portion connecting the inner ends of the upper groove wall portion and the lower groove wall portion in the vertical direction. The upper wall, lower wall, and bottom wall of the groove have equal side lengths in the closed cross-section.

5. The vehicle frame component according to claim 1 or 2, characterized in that: The groove on the rear side of the vehicle body is deeper than that on the front side.

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